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Question:
Why is sulfur trioxide and nitrogen dioxide harmful to plants?


Replies:
The sulfur dioxide and nitrogen oxide can combine with atmospheric water and result in "acid rain" or acidic deposition, which can affect lakes and streams, soil, and plants depending upon the acidic magnitude plus local environmental conditions from already acidic sensitive environments to more resistant naturally buffered limestone soils.

http://library.thinkquest.org/04oct/01590/pollution/acidrain.html

Anthony Brach, PhD
Missouri Botanical Garden
c/o Harvard University Herbaria


Both compounds react readily with water to form sulfuric acid and nitric acid respectively. These acids are very reactive toward any number of components in the plant.

Vince Calder



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